Use pipefail to capture build failures in ReviewBot.
Use pipefail to capture build failures in ReviewBot.

Bugs closed: AURORA-997

Reviewed at https://reviews.apache.org/r/29777/

medallia/aurora,mschenck/aurora,kidaa/aurora,shahankhatch/aurora,wfarner/aurora,protochron/aurora,wfarner/aurora,wfarner/aurora,shahankhatch/aurora,rdelval/aurora,rosmo/aurora,kidaa/aurora,kidaa/aurora,rdelval/aurora,shahankhatch/aurora,apache/aurora,apache/aurora,rdelval/aurora,protochron/aurora,thinker0/aurora,crashlytics/aurora,crashlytics/aurora,shahankhatch/aurora,apache/aurora,shahankhatch/aurora,kidaa/aurora,apache/aurora,thinker0/aurora,wfarner/aurora,protochron/aurora,kidaa/aurora,rdelval/aurora,medallia/aurora,rosmo/aurora,mschenck/aurora,medallia/aurora,protochron/aurora,crashlytics/aurora,crashlytics/aurora,mschenck/aurora,shahankhatch/aurora,rosmo/aurora,rosmo/aurora,rdelval/aurora,mschenck/aurora,mschenck/aurora,thinker0/aurora,apache/aurora,rosmo/aurora,medallia/aurora,thinker0/aurora,protochron/aurora,thinker0/aurora,wfarner/aurora,kidaa/aurora,wfarner/aurora,crashlytics/aurora,medallia/aurora,crashlytics/aurora,protochron/aurora,rdelval/aurora,medallia/aurora,mschenck/aurora,rosmo/aurora,thinker0/aurora,apache/aurora